In 1953 sir edmund hillary and tenzing norgay made the first successful ascent of mt. everest. part a how many slices of bread did each climber have to eat to compensate for the increase of the gravitational potential energy of the system climbers-earth? (one piece of bread releases about 1.0×106j of energy in the body.) assume that the height of mt. everest is 8850 m, the weight of a person is about 75 kg , and efficiency in converting the body's chemical energy into mechanical work is 11.0 %.

60

Explanation:

We start calculating the total work required to climb up the Everest.

The total energy would be,

Where m is the mass of the person (75kG)

g is the gravitational force (9.8m/s^2)

h is the high (8850m)

From our problem we have that only 11% of chemical energy ()is converted to mechanical energy(),

For this situation,

We know that only 1 piece of bread release , then

Therefore it is necessary 60 breads

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

it is a negative acceleration